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</style><article id="node-479322" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3406490" rel="bookmark">GEM test on run 644 and run 645</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3406490" class="lognumber" data-lognumber="3406490">3406490</a>. Submitted by <a href="https://logbooks.jlab.org/user/cpeng">cpeng</a> on <time datetime="2016-05-25T20:07:36-0400" pubdate="pubdate">Wed, 05/25/2016 - 20:07</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/pradlog">PRADLOG</a></td></tr><tr><th>Entry Makers: </th><td>Chao Peng</td></tr></table></div>
<div class="logentry node-content">
<p>We have set up a trigger from scintillators on the beam line for the GEM efficiency test.<br />
The test for this trigger has been down on run 644 & run 645.<br />
644: raw data without any zero suppression for GEM<br />
645: zero suppression is implemented for GEM.</p>
<p>We have seen better performance on CODA after implementing the zero suppression, the average rate increases from 1.1 kHz to 1.5 kHz. However, the performance is not very stable, sometimes we experienced a huge drop on rate.<br />
Hopefully we will have another major improvement with the implementation of the second GEM DAQ computer tomorrow. (expected 4 kHz - 5 kHz)</p>
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